Device for grinding razor blades



May 23, 1933.

A. STElNNER-GOLTL 1,909,987

DEVICE FOR GRINDING RAZOR BLADES Filed May 1. 1931 2 Sheets-Shem 1 May 23, 1933.

A. STEI NNER-GOLTL DEVICE FOR' GRINDING RAZOR BLADES 2, Sheets-Sheet 2 Filed May 1, 1951 Patented May 23, 1933 ARTHUR STEINNER-GfiLTL, OF VIENNA, AUSTRIA DEVICE FOR GRINDING RAZOR BLADES Application filed May 1, 1931, Serial No. 534,248; and in Austria December 10, 1930. I

Most of the known grinding and stroppmg apparatuses for razor blades requlrea comparatively long manual operation, 1n

order to fulfill their purpose and can only be employed for a certain shape and type of razor blades, mostly double-edged flat blades.

This invention relates to a razor blade grinding and stropping apparatus, which'is actuated by a single impetus, and automatically effects an accurate grinding, stropping, polishing and magnetizing of the blade, without any further manipulation on the part of the user. The apparatus also possesses the great advantage, that any type and shape of razor blades, for example single, double, triple, quadruple and multiple edged blades, besides hollow ground blades, can be ground, stropped, polished and magnetized in the same manner, without any alteration whatever being necessary.

The fundamental feature of the invention consists in that a paramagnetic spindle is rotatedby the magnetic force of attraction contained therein, actuates a paramagnetic frame with blade fitted thereon, and positively grinds, strops, polishes and ma-gnetizes, the likewise magnetically attracted blade edge by the relative shifting occurring between the spindle head and the blade edge.

Several embodiments of-the invention are illustrated by way of example in the accompanying drawings in whic Fig. 1 shows in top plan view a form of construction of the apparatus for hand drive.

Fig. 2 is a vertical section of Fig. 1. Fig. 3 is a part vertical section of Fig.

1 on a larger scale.

Fig. 4 shows a blade carrier with blade mounted thereon in top plan View and in longitudinal section.

Fig. 5 shows a second form of construction in top plan view.

Fig. 6 is a part side elevation of Fig. 5. Fig. 7 shows a special construction of the grinding element in vertical section,

Figs. 8 to 11 show three forms of construction of blade carriers in top plan view and in longitudinal section.

A paramagnetic spindle 2 projects upwardly from a lid (Figs. 2, 3 and 6) of.a

box 1 forming a guide surface 1' and is rotated by hand or by clockwork or by electric drive. spindle 2 forms a flat cone, the outer surface of which is inclined in-correspondence with the bevel of the cutting edge of the blade to beground. A frame 4 of magnetic material is placed on the guide surface 1'. The frame 4 is provided with a'longitudinal bridge 6, which carries at suitable distances apart pins 6 for holding the razor blade 5. Figs. 4 and 8 show a frame 4 for doubleedged blades, Fig. 9 shows a frame for triple-edged blades and Fig. 10 a frame for quadruple-edged blades. For holding hollow ground blades the frame 4 is shaped as illustrated in Fig. 11. The frame 4: is placed against the cylindrical portion of the projecting end of the spindle 3 and held in position by the magnetic attraction of the spindle. The edge of the blade 5 to be sharpened, projecting beyond the upper edge of the frame 4, is positively brought tobear on the conical spindle head, where it is also magnetically held.

By turning the spindle 3 and owing to the magnetic force of attraction the outer side (Figs. 1, 2 and 3) or the: inner side (Figs. 5 and 6) of the frame 4 is moved along the spindle. The blade 5 placed on the frame 4 is positively shifted in the direction of the movement of the frame 4, the 8 blade edge, being held uniformly tight, slides over the conical spindle head and is ground or stropped, polished and magnetized. I

The invention is based on two movements: 9

1. The slight relative shifting or moving in like direction for stropping or polishing of sharp or comparatively sharp blades. During this operation the frame 4, as shown in Figs. 1, 2 and 3, moves with its outer edge against the spindle. The blade is carried by a frame 4 of magnetic material, corresponding in shape to, but smaller than the blade, said frame bearing with its outer surface against the spindle 2, its outer sur- The projecting end 3 of the 55 bla e edge and also from face being shifted along the splindleby the rotation of this latter, so that t e movement of the blade edge is in the same direction as thedirection of rotation of the spindle and consequently a sli ht relative shifting occurs. The relative s ifting results from the difference in speed between the travel of the contacting radius R of the frame 4 (Fi 3) and the contactin radius 1- of the the retardation of the'movement of the blade caused by the frictional resistance between the frame and the guide surface 1. The spindle 2 and the blade edge move in the same direction.

2. Maximum relative shifting or movement in opposite directions for grinding strongly worn blades. 'In this instance the blade is surrounded by the magnetic frame 4 (Figs. 5 and 8), which bears with its inner surface against the spindle 2 and is shifted along the spindle when this latter is rotated.

Thus, the b ade moves in the opposite direction to the direction of rotation of the spindle so that maximum relative shifting occurs.

These two movementphenomena are indicated by arrows in the accompanying drawup and down and consequently require time and patience, the present apparatus is operated by a single impetus that is in the apparatus for hand drive by a short single operation, in the apparatus driven by clockwork by winding, and in the apparatus driven electricall by'switching in the source of current, and t e grindin is effected automatically by the turning of the spindle.

A further advantage consists in that,

merely by altering the shape of the frame 4,

any shape or type of razor blade can be ground, stropped, polished and magnetized, without it being necessary to alter the ap paratus proper. Thus, as already mentioned, not only double-edged blades (Figs- 1 and 5), triple-ed ed blades (Fig. 10), but

also multiple-edge as well as hollow ground blades (Fig. 11) can be ground b means of frames adapted to the shape of tl ie-blade.

Further, in the apparatus according to the invention the microscopically apparent bun-. dle-like frayed out fringes of the blade are laid in the cutting plane-b the gliding on the. rotating flattened spin le head and stabilized by the magnetism absorbed. Moreover, owing to the automatic acting and to ressure of theedge rier for the blade made of paramagnetic material adapted to be placed'loosely on the upper surface of said casing and owing to the magnetic attraction between said spindle and said carrier to bear against the cylindricalportion of said spindle and be displaced by the rotation of said spindle to feed the edge of the blade along said grinding. surface.

2 An apparatus for grinding, stropping, polishing and ma etlzing razor blades, comprisin in combination a casing, a vertical sp' (1 e of magnetic material in and p 'ng froni'the upper surface of said asing upper end face, means in said casing for rotating said spindle, and a removable carrier for the blade in the form of a frame made of paramagnetic material in the shape of but smaller than the blade, adapted to placed loosely on the upper surface 0 said casing and owing to the magnetic atvlng a grinding surface on its traction between said spindle and said carrier to bear against the'cylindrical portion of said spindle and be displaced by the rotation of said spindle to feed the edge of the blade along said grinding surface.

3. An apparatus for grinding, stropping, polishing and ma etlzing razor blades, comprisin in combination a casing, a vertical spind e of magnetic material in and projecting from the upper surface of said casing having a grinding surface on its upper end face, means in said casing for rotating said spindle, and a removable carrier for the blade in the form of a frame made of paramagnetic material in the shape of but larger than' and consequently extending on all sides around said blade ada ted to be (placed loosely on the upper sur ace of sai casing and owing to the magnetic attraction between said spindle and said carrier to bear with its inner surface against the cylindrical portion of said spindle and be displaced by tlre rotation. of said spindle to feed the edge of the blade along said grinding surface, in the op osite direction to the direction of rotation 0 said spindle. p

4. An apparatus for grinding, stropping, polishing and magnetizing razor blades,

comprisin cal spindfia of magnetic materi in and projecting from the upper surface of said casing having a metal cap with inserted grindstone adapted to be placed on the upper end of said spindle to form a grinding surface, means in said casin for rotating said spindle, and a removab e carrier for the blade made of paramagnetic material a'da ted to be placed loosel on the upper sur ace of said casing an owin to the magnetic attraction between sai spindle and said carrier to bear against the cylindrical portion of said spindle and be displaced by the rotation of said spindle to feed the edge of the blade alongsaid grinding surface.

In testimony whereof I afiix my signature.

ARTHUR STEINNER-GOLTL,

in combination a. casin a verti-' 

